/Engine/Source/Runtime/Engine/Classes/GameFramework/RootMotionSource.h
Get a RootMotionSource from this Group by name
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FRootMotionSource](API\Runtime\Engine\GameFramework\FRootMotionSource) > GetRootMotionSource ( [FName](API\Runtime\Core\UObject\FName) InstanceName )